Patent US2742369A successfully refreshed from Google Patents.
US2742369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibiting composition and method of using same
Assignee: CALGON Inc
•
Filing: 1954-05-12
•
Granted: 1956-04-17
•
Expires: 1974-05-12
Abstract
No abstract record available.
Inventors
- 👤 George B Hatch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:35
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A METHOD OF RETARDING THE CORROSION OF BOTH FERROUS METALS AND CUPROUS METALS WHICH ARE IN CONTACT WITH WATER WHICH COMPRISES ADDING TO WATER WHICH IS CORROSIVE TO BOTH METALS AND CONTAINS INSUFFICIENT CALCIUM AND CARBONATE ION TO DEPOSIT CALCIUM CARBONATE UNDER THE CONDITIONS IN WHICH THE WATER IS PRESENT, (A) A THIOL OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THIAZOLES, OXAZOLES, AND IMIDAZOLES, (B) A MOLECULARLY DEHYDRATED PHOSPHATE WHICH UNDER THE CONDITIONS PRESENT IS CAPABLE OF EXERTING A PROTECTIVE EFFECT UPON THE FERROUS METALS, AND (C) A ZINC COMPOUND WHICH UNDER THE CONDITIONS PRESENT IS SOLUBLE IN SAID WATER.
Claim 2
Independent Claim
102 words
A METHOD OF RETARDING THE CORROSION OF BOTH FERROUS METALS AND CUPROUS METALS WHICH ARE IN CONTACT WITH WATER WHICH COMPRISES ADDING TO WATER WHICH IS CORROSIVE TO BOTH METALS AND CONTAINS INSUFFICIENT CALCIUM AND CARBONATE ION TO DEPOSIT CALCIUM CARBONATE UNDER THE CONDITIONS IN WHICH THE WATER IS PRESENT, (A) A THIOL OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THIAZOLES, OXAZOLES, AND IMIDAZOLES, (B) A MOLECULARLY DEHYDRATED PHOSPHATE WHICH UNDER THE CONDITIONS PRESENT IS CAPABLE OF EXERTING A PROTECTIVE EFFECT UPON THE FERROUS METALS, AND (C) A ZINC COMPOUND WHICH UNDER THE CONDITIONS PRESENT IS SOLUBLE IN SAID WATER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |